KR101588917B1 - Terminal apparatus, reception method and integrated circuit - Google Patents

Abstract

A method of mapping a synchronous signal and a notification signal with high resource utilization efficiency is realized when a first system for allocating independent single communication for each unit band and a second system for allocating a plurality of unit bands coexist in a single communication A base station, a terminal, a band allocation method, and a downlink data communication method. In the base station 200, the OFDM signal forming unit 225 uses the P-SCH, the S-SCH, the P-BCH, and the D-BCH, which can be decoded by both the LTE terminal and the LTE + And maps the D-BCH + that can be decoded only by the LTE + terminal to all of a plurality of unit bands to form a transmission multiplexed signal. When the terminal that has transmitted the terminal capability information is an LTE + terminal, the control unit 265 transmits a band movement instruction for instructing the change of the reception band to the terminal.

Description

TECHNICAL FIELD [0001] The present invention relates to a terminal apparatus, a receiving method, and an integrated circuit,

The present invention relates to a base station, a terminal, a band allocation method, and a downlink data communication method.

In 3GPP LTE, OFDMA (Orthogonal Frequency Division Multiple Access) is adopted as a downlink communication method. In a wireless communication system to which 3GPP LTE is applied, a wireless communication base station apparatus (hereinafter, simply referred to as "base station") transmits a synchronization signal (SCH) and a broadcast signal (BCH ). Then, the wireless communication terminal device (hereinafter, simply referred to as " terminal ") secures synchronization with the base station by taking the SCH first. That is, the terminal performs cell search first. After that, the terminal reads the BCH information to acquire the base station-specific parameters (e.g., frequency bandwidth, etc.) (see Non-Patent Documents 1, 2 and 3).

In addition, standardization of 3GPP LTE-advanced which realizes higher communication speed than 3GPP LTE has been started. The 3GPP LTE-advanced system (hereinafter referred to as " LTE + system ") follows a 3GPP LTE system (hereinafter referred to as " LTE system "). In 3GPP LTE-advanced, base stations and terminals capable of communicating at a broadband frequency of 20 MHz or more are expected to be introduced to realize a downlink transmission rate of at least 1 Gbps or more. However, in order to prevent unnecessary complication of the terminal, the terminal capability of the frequency band will be defined. As the terminal capability, for example, the minimum value of the support bandwidth is specified to be 20 MHz.

[Prior Art Literature]

[Non-Patent Document]

Non-Patent Document 1: 3GPP TS 36.211 V8.3.0, "Physical Channels and Modulation (Release 8)," May 2008

Non-Patent Document 2: 3GPP TS 36.212 V8.3.0, "Multiplexing and channel coding (Release 8)," May 2008

Non-Patent Document 3: 3GPP TS 36.213 V8.3.0, "Physical layer procedures (Release 8)," May 2008

Here, it is assumed that a base station (hereinafter referred to as " LTE + base station ") corresponding to an LTE + system supports a terminal compatible with an LTE system (hereinafter may be referred to as an LTE terminal). The LTE + base station is configured to be able to communicate in a frequency band including a plurality of " unit bands ". The " unit band " here is a band having a width of 20 MHz, a band including a SCH (Synchronization Channel) in the vicinity of the center, and is defined as a basic unit of the communication band. The " unit band " may be expressed as Component Carrier (s) in English in 3GPP LTE.

1 is a diagram showing an example of a mapping between an SCH and a BCH in an LTE + system compatible base station.

In Fig. 1, the communication bandwidth of the LTE + base station is 60 MHz and includes three unit bands. The SCH and the BCH that can be decoded by the LTE terminal are arranged at intervals of 20 MHz and in the vicinity of the center frequency of each unit band. Also, a PDCCH (Physical Downlink Control Channel) is distributed over each unit band.

By employing this mapping method, an LTE terminal having a terminal capability of 20 MHz can synchronize with an LTE + base station even if it enters a unit band for the first time, and furthermore, can start communication by reading the BCH. In addition, a unit band in which a terminal synchronizes with a base station may be referred to as an " initial access unit band ". The BCH includes frequency band information, and the communication band is divided for each unit band by the frequency band information. From the above, the unit band is also defined as a band defined by the frequency band information in the BCH, or a band defined by the dispersion width when the PDCCH is distributed and arranged.

However, the LTE + base station needs to support not only the LTE terminal but also an LTE + system compliant terminal (hereinafter also referred to as " LTE + terminal "). The LTE + terminal includes a terminal having a terminal bandwidth of a communication bandwidth obtained by combining a plurality of terminals and a unit band having a terminal capacity of the same communication bandwidth as the unit band similarly to the LTE terminal.

That is, in practice, an integrated communication system including an LTE system that allocates a single communication independent of each unit band, and an LTE + system that can allocate a plurality of unit bands to a single communication follows the LTE system.

In this integrated communication system, the LTE + base station transmits a synchronization signal and a notification signal (i.e., an LTE synchronization signal and an LTE notification signal) and an LTE (base station signal) that can be decoded by both the LTE terminal and the LTE + It is necessary to map the synchronization signal and the notification signal (i.e., the LTE + synchronization signal and the LTE + notification signal) necessary for the LTE + terminal although it can not be decoded by the terminal.

However, a mapping method of a synchronization signal and a notification signal in such a new integrated communication system has not been proposed yet.

An object of the present invention is to provide a first system for allocating independent single communications for each unit band having a predetermined bandwidth and a second system for following a first system and assigning a plurality of unit bands to a single communication A band allocation method, and a downlink data communication method for realizing a method of mapping a synchronization signal and a notification signal with high resource use efficiency in the case of coexistence.

The base station of the present invention includes a first system for allocating a single independent communication for each unit band having a predetermined bandwidth and a second system for allocating a plurality of the unit bands to a single communication, 2 system-compatible base station, the synchronization channel, the first system notification signal, and the first system dynamic (dynamic) notification signal, both of which can be decoded by both the first system-enabled terminal and the second system- To a unit band of a plurality of unit bands usable by the first system corresponding terminal and mapping a second system dynamic notifying signal which can be decoded only by the second system corresponding terminal to all of the plurality of unit bands, And a transmitting means for transmitting the multiplexed signal.

The terminal of the present invention is a second system compatible terminal that receives a data signal transmitted from the base station in a destination band that corresponds to a band movement instruction transmitted from the base station, And control means for starting the reception processing of the second system dynamic notification signal to the receiving means after the start of the reception processing of the data signal.

The band allocation method of the present invention is a band allocation method in a combined communication system including a first system for allocating independent single communication for each unit band having a predetermined bandwidth and a second system capable of allocating a plurality of unit bands to a single communication And a second system-compatible base station for allocating a use unit band used for data communication to a second system-compatible terminal, the second system-compatible base station being arranged at a predetermined frequency position from the second system- A step in which the allocation target terminal sequentially moves and searches the reception band for a synchronization channel which can be decoded by both the corresponding terminal and the second system corresponding terminal, Corresponding to the first system corresponding terminal and the second system corresponding terminal, Comprising the steps of: preparing a first system notification signal, a control channel, and a first system dynamic notification signal that both terminals of the corresponding terminal can decode, simultaneously with the RACH preamble transmission upon receipt by the assignment target terminal; Transmitting a RACH preamble to a resource corresponding to RACH resource information included in the first system dynamic notifying signal transmitted from the second system corresponding to the RACH preamble, Reporting the resource assignment information to the control channel; and allocating, to the second system-compatible base station, the terminal capability information of the own system to the second system-compatible base station using the resource indicated by the reporting resource allocation information And the second system compliant base station transmits the terminal capability information to the second system correspondence And assigning a unit band other than the initial access unit band as the use unit band and instructing movement of the reception band by transmitting information about the allocation to the allocation target terminal when indicating that the terminal is a terminal .

The downlink data communication method of the present invention is a downlink data communication method including the band allocation method in a step wherein after the allocation target terminal moves the reception band to the movement destination unit band, Receiving a second system dynamic notification signal that can be received based on a control channel transmitted in the moving destination unit band and a corresponding control channel from the second system- And the step of receiving the allocation target terminal.

According to the present invention, when a first system for allocating independent single communication for each unit band having a predetermined bandwidth and a second system capable of allocating a plurality of unit bands for a single communication coexist, It is possible to provide a base station, a terminal, a band allocation method, and a downlink data communication method that realize a mapping method of a synchronization signal and a notification signal.

1 is a diagram showing an example of mapping of an SCH and a BCH in an LTE + system compatible base station,
2 is a diagram showing an example of mapping of an SCH and a BCH in an LTE + system compatible base station,
3 is a conceptual diagram illustrating that an LTE + base station corresponding to 60 MHz transmits SCH and BCH only in a unit band,
4 is a block diagram showing a configuration of a terminal according to Embodiment 1 of the present invention;
5 is a block diagram showing the configuration of a base station according to Embodiment 1 of the present invention;
6 is a diagram for providing a description of a method of mapping a synchronization signal, a notification signal, and a control channel in a base station according to Embodiment 1 of the present invention;
7 is a sequence diagram showing signal transmission / reception between a terminal and a base station,
8 is a diagram for providing a description of a method of mapping a synchronization signal, a notification signal, and a control channel in a base station according to Embodiment 2 of the present invention,
9 is a diagram for explaining an operation of a terminal according to Embodiment 2 of the present invention.

As described above, since the LTE + base station needs to support the LTE terminal, the first and second synchronization signals (Primary SCH: P-SCH), Secondary SCH (S-SCH) It is necessary to transmit the first notification signal (Primary BCH: P-BCH) and the dynamic notification signal (Dynamic BCH: D-BCH) according to the LTE specification. Here, the P-SCH and the S-SCH correspond to the first system synchronization signal, the P-BCH corresponds to the first system notification signal, and the D-BCH corresponds to the first system dynamic notification signal.

The LTE + base station also needs to support LTE + terminals. Therefore, the LTE + BS uses the first SCH + (P-SCH +), the second SCH + (S-SCH +), (Primary BCH +: P-BCH +) and Dynamic BCH + (Dynamic BCH +: D-BCH +). Here, P-SCH + and S-SCH + correspond to the second system synchronization signal, P-BCH + corresponds to the second system notification signal, and D-BCH + corresponds to the second system dynamic notification signal.

Therefore, the present inventors first considered a mapping method of mapping SCH + and BCH + to the mapping frequencies of SCH and BCH shown in FIG. 1 (see FIG. 2).

According to the mapping method shown in FIG. 2, an LTE terminal and an LTE + terminal with a terminal capability of 20 MHz can receive SCH and BCH (SCH +, BCH +) in all bands. Therefore, since the LTE terminal and the LTE + terminal can coexist in the entire band, smoothing of the data traffic in the unified communication system can be expected.

However, as apparent from Fig. 2, the downlink resources used for transmission of the SCH and the BCH are increased as compared with the LTE system, and the resource utilization efficiency is lowered.

Therefore, in order to improve resource utilization efficiency, a method of mapping SCH and BCH (SCH +, BCH +) to only a part of unit bands included in the communication band of the LTE + terminal has been devised.

3 is a conceptual diagram showing that an LTE + base station corresponding to 60 MHz transmits SCH and BCH only in a unit band. Here, the SCH and the BCH are transmitted only in the central unit band (unit band 2 in Fig. 3) among a plurality of unit bands included in the communication band of the LTE + terminal. Thus, resources for transmission of SCH and BCH are reduced.

However, in this case, terminals (including LTE terminals and LTE + terminals) that can only support 20 MHz can not be connected to unit band 1 and unit band 3. Therefore, when the number of LTE + terminals corresponding to 40 MHz or 60 MHz is small, the unit bands on both sides may be unused (unused), which causes a problem that the resource utilization efficiency deteriorates.

After recognizing the above problem, the inventor of the present invention has focused on the capability of receiving the SCH and BCH for LTE terminals in the LTE + terminal since the LTE + terminal also needs to connect to the LTE base station.

It is noted that, when the same LTE + base station supports LTE terminals and LTE + terminals, the contents (for example, the number of antenna ports, the system band, etc.) of notification signals about the system in each unit band are very similar .

Taking the above points into consideration, the present inventors have reached the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof will be omitted.

(Embodiment 1)

A communication system according to Embodiment 1 of the present invention includes a first system that allocates independent single communications for each unit band having a predetermined bandwidth and a second system that allocates a plurality of unit bands to a single communication Lt; RTI ID = 0.0 > system. ≪ / RTI > Hereinafter, the case where the first system is an LTE system and the second system is an LTE + system will be described as an example.

[Configuration of terminal]

4 is a block diagram showing the configuration of the terminal 100 according to the first embodiment of the present invention. The terminal 100 is an LTE + terminal. 4, the terminal 100 includes a receiving RF unit 105, an OFDM signal demodulating unit 110, a frame synchronizing unit 115, a separating unit 120, a notification information receiving unit 125, A PDCCH receiver 130, a PDSCH (Physical Downlink Shared Channel) receiver 135, a controller 140, a random access channel (RACH) preamble 145, a modulator 150, (Single-Carrier Frequency Division Multiple Access) signal forming unit 155, and a transmitting RF unit 160.

The reception RF unit 105 is configured to be able to change the reception band. The reception RF unit 105 receives the center frequency instruction from the control unit 140, and moves the reception frequency band by moving the center frequency based on the center frequency indication. The reception RF unit 105 performs reception wireless processing (down-conversion, analog digital (A / D) conversion, and the like) on the received radio signal received via the antenna in the reception band, And outputs it to the jug 110. Here, the center frequency of the reception band is set as the reference frequency, but any frequency included in the reception band can be set as the reference frequency.

The OFDM signal demodulation unit 110 has a CP (Cyclic Prefix) removing unit 111 and a Fast Fourier Transform (FFT) unit 112. The OFDM signal demodulation unit 110 receives a reception OFDM signal from the reception RF unit 105. In the OFDM signal demodulator 110, the CP demodulator 111 removes the CP from the received OFDM signal, and the FFT block 112 converts the received OFDM signal after removing the CP into a frequency domain signal. The frequency domain signal is output to the frame synchronizing unit 115.

The frame synchronization unit 115 searches for a synchronization signal SCH contained in a signal received from the OFDM signal demodulation unit 110 and synchronizes with the base station 200 to be described later. The unit band including the found synchronization signal (SCH) becomes the initial access unit band. The synchronization signal includes P-SCH and S-SCH. More specifically, the frame synchronization unit 115 searches for the P-SCH and synchronizes with the base station 200, which will be described later.

After detecting the P-SCH, the frame synchronization unit 115 performs blind decision on the S-SCH arranged in the resource having a predetermined relationship with the placement resource of the P-SCH. As a result, precise synchronization is obtained, and the cell ID corresponding to the S-SCH sequence is acquired. In other words, the frame synchronizing unit 115 performs the same processing as the normal cell search.

The frame synchronization unit 115 outputs frame synchronization timing information in accordance with the establishment synchronization timing to the separation unit 120. [

The demultiplexing unit 120 demultiplexes the reception signal received from the OFDM signal demodulation unit 110 into a notification signal and a control signal (i.e., a PDCCH signal) and a data signal (i.e., a PDSCH signal) . The notification signal is output to the notification information reception unit 125, the PDCCH signal is output to the PDCCH reception unit 130, and the PDSCH signal is output to the PDSCH reception unit 135. Here, the PDSCH includes individual information directed to a terminal.

The notification information receiving unit 125 reads the contents of the input P-BCH and acquires information on the number of antennas of the base station 200, which will be described later, and the downlink system bandwidth. This information is output to the control unit 140. [

The notification information receiving unit 125 receives the D-BCH signal included in the PDCCH signal and allocated to the resource indicated by the D-BCH resource position information (here, D-BCH frequency position information) extracted from the PDCCH receiving unit 130 (For example, frequency and frequency band of the uplink pair band, or information such as PRACH (Physical Random Access Channel)) included in the received D-BCH signal. This information is output to the control unit 140. [ In this specification, the frequency will be described as an example of a resource.

The PDCCH receiver 130 receives the information (D-BCH and D-BCH +) included in the PDCCH signal received from the separator 120 based on the frequency position in accordance with the decoding instruction from the controller 140, PDSCH, and uplink frequency allocation information (here, PUSCH frequency position information) are extracted. Among the extracted information, D-BCH and D-BCH + are outputted to the notification information receiving unit 125, the frequency position information where the PDSCH is allocated is output to the PDSCH receiving unit 135, and the uplink frequency allocation information is transmitted to the SC- (155). Here, the frequency position information in which the D-BCH is placed and the frequency position information in which the PDSCH is placed are extracted before transmission of the RACH preamble, the uplink frequency allocation information is extracted after transmission of the RACH preamble, The position information is extracted after the reception of the data signal is started. That is, only frequency position information in which D-BCH + is located is extracted in the destination band, and other information is extracted in the initial access unit band.

The PDSCH receiving unit 135 extracts a band movement instruction from the PDSCH signal received from the separating unit 120 based on the frequency position information on which the PDSCH is placed from the PDCCH receiving unit 130. [ Then, the extracted band movement instruction is outputted to the control unit 140.

Here, the band movement instruction includes all the information necessary for starting communication in the movement destination unit band. The PDCCH and PDSCH in the unit band after the movement, for example, the center frequency of the movement destination unit band and the pair up band information, the center frequency of the movement destination unit band (i.e., corresponding to the center frequency of the LTE + terminal PDCCH) (I.e., frequency position information in which the PDCCH and the PDSCH are arranged, and the like). However, in order to reduce the amount of signaling required for the band movement instruction, the center frequency of the movement destination unit band to be adjusted by the reception RF unit 105 of the LTE + terminal is determined by the bandwidth of the downlink subcarrier (15 KHz) And is reported as a multiple of 300 KHz which is the minimum common multiple of the minimum resolution (100 KHz) of the frequency at which the RF unit 105 can be set. If the LTE + base station transmits a plurality of SCHs using one IFFT circuit, the interval of the SCHs can be no more than an integer multiple of 15 KHz. Further, to match the center frequency of the reception band to any SCH on the terminal side, It should be a multiple of.

The control unit 140 sequentially changes the reception band of the reception RF unit 105 before synchronization is established. The control unit 140 transmits the initial access unit band including the frequency position of the synchronization channel from the base station 200, which will be described later, before transmission of the RACH preamble, And prepares to transmit the RACH preamble based on the decodable LTE notification signal, the control channel, and the LTE dynamic notification signal. After transmitting the RACH preamble, the control unit 140 acquires the report resource allocation information notified by the control channel from the base station 200, which will be described later, and acquires its own terminal capability information To the base station 200 and changes the reception band from the initial access unit band to the use unit band based on the band movement instruction transmitted by the base station 200 according to the terminal capability information.

Specifically, the control unit 140 specifies the arrangement information of the PDCCH based on the information obtained by the notification information receiving unit 125. [ The allocation information of the PDCCH is uniquely determined by the number of antennas of the base station 200 to be described later and the downlink system bandwidth. The control unit 140 outputs the arrangement information of the PDCCH to the PDCCH receiving unit 130, and instructs decoding of the signal arranged at the frequency position according to the information.

The control section 140 also controls the RACH preamble section 145 to transmit the RACH preamble according to the information included in the received D-BCH signal received from the notification information receiving section 125, that is, the frequency band of the upstream frequency band and the PRACH .

When the uplink frequency allocation information is received from the PDCCH receiver 130, the control unit 140 outputs the terminal capability information (i.e., Capability information) of the own apparatus to the modulator 150, And outputs the allocation information to the SC-FDMA signal forming unit 155. Thereby, the terminal capability information is mapped to a frequency corresponding to the uplink frequency allocation information and transmitted.

The control unit 140 outputs a center frequency instruction to the RF receiving unit 105 so that the reception band of the reception RF unit 105 coincides with the movement destination band based on the band movement instruction received from the PDSCH reception unit 135 . Here, the control unit 140 outputs a decoding instruction to the PDCCH receiving unit 130 when it controls the movement of the reception band based on the band movement instruction. Thereby, the PDCCH receiver 130 can receive the PDCCH signal in the movement destination unit band. By specifying the arrangement frequency of the D-BCH + from the PDCCH signal in the movement destination unit band, the notification information reception unit 125 can receive the D-BCH + arranged in the movement destination unit band. The decoding instruction is output after the PDSCH receiving unit 135 starts receiving the data signal.

When data communication with the base station 200 to be described later is terminated (that is, when there is no data to be transmitted to both the base station 200 side and the terminal 100 side) , And transits the mode of the terminal 100 to the idle mode. At this time, the control unit 140 moves the reception band of the terminal 100 from the movement destination unit band to the initial access unit band. Thereby, the terminal 100 can receive the SCH and the BCH even in the idle mode, so that the new communication can be smoothly started.

The RACH preamble section 145 outputs information on the uplink frequency band and the frequency position of the PRACH included in the instruction to the SC-FDMA signal forming section 155 together with the RACH preamble sequence in accordance with an instruction from the control section 140 do.

The modulation section 150 modulates the terminal capability information received from the control section 140 and outputs the obtained modulation signal to the SC-FDMA signal forming section 155. [

The SC-FDMA signal forming unit 155 forms an SC-FDMA signal from the modulation signal received from the modulating unit 150 and the RACH preamble sequence received from the RACH preamble unit 145. In the SC-FDMA signal forming unit 155, the discrete Fourier transform (DFT) unit 156 converts the input modulated signal onto the frequency axis, and outputs the obtained plurality of frequency components to the frequency mapping unit 157 . The plurality of frequency components are mapped to frequencies corresponding to the uplink frequency allocation information in the frequency mapping unit 157, and are converted into time-base waveforms by the IFFT unit 158. The RACH preamble sequence is also mapped to the frequency according to the uplink frequency allocation information in the frequency mapping unit 157 and is converted to a time axis waveform by the IFFT unit 158. In the CP adding unit 159, a CP is added to the time-base waveform to obtain an SC-FDMA signal.

The transmission RF section 160 performs transmission radio processing on the SC-FDMA signal formed in the SC-FDMA signal forming section 155, and transmits the SC-FDMA signal via the antenna.

[Configuration of base station]

5 is a block diagram showing a configuration of a base station 200 according to Embodiment 1 of the present invention. The base station 200 is an LTE + base station. The base station 200 always transmits a PDCCH indicating frequency scheduling information of PDCCH and D-BCH + indicating frequency scheduling information of P-SCH, P-BCH, D-BCH, D-BCH + , And continues to transmit by the OFDM method.

5, the base station 200 includes a PDCCH generation unit 205, a PDSCH generation unit 210, a notification signal generation unit 215, a modulation unit 220, an OFDM signal formation unit 225, A reception RF unit 235, a CP removal unit 240, an FFT unit 245, an extraction unit 250, a RACH preamble reception unit 255, (260), and a control unit (265). The CP removing unit 240, the FFT unit 245, the extracting unit 250, the RACH preamble receiving unit 255 and the data receiving unit 260 form SC-FDMA signal demodulating means.

The PDCCH generation unit 205 receives uplink frequency allocation information from the control unit 265 to the UE 100 and generates a PDCCH signal including the uplink frequency allocation information. PDCCH generator 205 masks the uplink frequency allocation information with the CRC according to the RACH preamble sequence transmitted from the terminal 100 and then includes the uplink frequency allocation information in the PDCCH signal. The generated PDCCH signal is output to the modulator 220. Here, a sufficient number of RACH preamble sequences are prepared, and the terminal selects an arbitrary sequence from the RACH preamble sequence and accesses the base station. That is, since it is very unlikely that a plurality of terminals simultaneously access the base station 200 using the same RACH preamble sequence, the terminal 100 receives the PDCCH which is a CRC mask corresponding to the corresponding RACH preamble sequence, It is possible to detect the magnetic upstream uplink frequency allocation information without any problem.

The PDSCH generation unit 210 receives the band movement instruction from the control unit 265 and generates a PDSCH signal including the corresponding band movement instruction. In addition, the PDSCH generating unit 210 receives transmission data after the transmission of the band movement instruction. The PDSCH generation unit 210 generates a PDSCH signal including input transmission data. The PDSCH signal generated by the PDSCH generation unit 210 is input to the modulation unit 220.

The notification signal generation unit 215 generates a notification signal and outputs the notification signal to the modulation unit 220. This notification signal includes P-BCH, D-BCH, and D-BCH +.

The modulator 220 modulates the input signal to form a modulated signal. The input signals are a PDCCH signal, a PDSCH signal, and a notification signal. The formed modulation signal is input to the OFDM signal forming unit 225.

The OFDM signal forming unit 225 forms an OFDM signal mapped to a predetermined resource when the modulation signal and the synchronization signal (P-SCH, S-SCH) are input. In the OFDM signal forming unit 225, the multiplexing unit 226 multiplexes the modulation signal and the synchronization signal, and the IFFT unit 227 subjects the multiplexed signal to serial parallel conversion and then performs inverse fast Fourier transform to obtain a time waveform. The CP adding unit 228 adds a CP to the time waveform to obtain an OFDM signal.

The transmission RF section 230 performs transmission radio processing on the OFDM signal formed in the OFDM signal forming section 225 and transmits the OFDM signal via the antenna.

The reception RF unit 235 performs reception wireless processing (down-conversion, analog-digital (A / D) conversion, and the like) on the reception radio signal received via the antenna in the reception band, (240).

The CP removing unit 240 removes the CP from the received SC-FDMA signal, and the FFT unit 245 converts the received SC-FDMA signal after CP removal into a frequency domain signal.

The extraction unit 250 extracts a signal mapped to a resource corresponding to the RACH from the frequency domain signal received from the FFT unit 245 and outputs the extracted signal to the RACH preamble receiving unit 255. [ The extraction of the signal mapped to the resource corresponding to this RACH is always performed so that the LTE + terminal can transmit the RACH preamble to the base station 200 at any time.

The extracting unit 250 extracts a signal corresponding to the uplink frequency allocation information received from the control unit 265 and outputs the extracted signal to the data receiving unit 260. [ The extracted signal includes terminal capability information transmitted by the terminal 100 on the PUSCH.

The RACH preamble receiving unit 255 first converts the extracted signal received from the extracting unit 250 into a single-carrier signal on the time axis. That is, the RACH preamble receiving unit 255 includes an inverse discrete Fourier transform (IDFT) circuit. Then, the RACH preamble receiving section 255 takes correlation between the obtained single carrier signal and the RACH preamble pattern, and determines that the RACH preamble is detected when the correlation value is equal to or higher than a predetermined level. Then, the RACH preamble receiving unit 255 outputs the RACH detection report including the detected pattern information of the RACH preamble (for example, the sequence number of the RACH preamble) to the control unit 265. [

The data receiving unit 260 converts the extracted signal received from the extracting unit 250 into a single carrier signal on the time axis and outputs the terminal capability information contained in the obtained single carrier signal to the control unit 265. [ After transmitting the band movement instruction, the data reception unit 260 transmits the obtained single carrier signal to the upper layer as reception data.

Upon receiving the RACH detection report from the RACH preamble receiving unit 255, the control unit 265 allocates the uplink frequency to the terminal 100 that has transmitted the detected RACH preamble. The allocated uplink frequency is used for transmission of the terminal capability information in the terminal 100 or the like. The uplink frequency allocation information is output to the PDCCH generation unit 205. [

Upon receiving the terminal capability information from the data reception unit 260, the control unit 265 determines whether the source terminal is the LTE terminal or the LTE + terminal based on the terminal capability information. If it is determined that the terminal is an LTE + terminal, the control unit 265 forms a band movement instruction for the LTE + terminal and outputs it to the PDSCH generation unit 210. The band movement instruction is formed in accordance with the congestion state of each unit band. However, as described above, this band movement instruction includes difference information from the center frequency position of the reception RF unit provided in the terminal. The difference information has an integer multiple of 300 KHz. In addition, the band movement instruction also includes the arrangement position information of the PDCCH and the PDSCH in the movement destination unit band. The band shift instructions are collected by the PDSCH generator 210 for each terminal and input to the modulator as in the case of normal downlink data.

After giving the band movement instruction, the control unit 265 controls the PDCCH and the PDSCH for the target terminal of the instruction to be placed in the movement destination unit band.

It is also possible to provide the terminal 100 with information about the terminal 100 after completing a series of data communications with the terminal 100 (i.e., after data to be transmitted to both the base station 200 and the terminal 100 are lost) When it becomes necessary to transmit authorization data, the control section 265 transmits using the initial access unit band. This is because, after the completion of a series of data communication, the terminal 100 moves the reception band from the movement destination unit band to the initial access unit band and becomes an idle state.

[Operation of Terminal 100 and Base Station 200]

(Synchronization signal, notification signal, and mapping method of control channel)

Fig. 6 is a diagram for explaining a method of mapping a synchronization signal, a notification signal, and a control channel in the base station 200. Fig. The base station 200 transmits the synchronization signal, the notification signal, and the control channel by the mapping method shown in Fig. 6 or the like.

As shown in Fig. 6, the base station 200 has a plurality of unit bands in the communication band. Of the plurality of unit bands, P-SCH, S-SCH, P-BCH, and D-BCH that can be read from both the LTE terminal and the LTE + terminal are mapped to only some unit bands. In addition, D-BCH + capable of decoding only the LTE + terminal is mapped to all of a plurality of unit bands. The frequency position to which the P-SCH and the S-SCH are mapped is the center frequency of the mapped unit band or the vicinity thereof.

This mapping method is a mapping method with high resource use efficiency as compared with the mapping method shown in FIG. The control channel (PDCCH) indicating the frequency position information of the P-SCH, the S-SCH, the P-BCH, the D-BCH and the D-BCH is always transmitted repeatedly.

(Signal transmission / reception between the terminal 100 and the base station 200)

7 is a sequence diagram showing signal transmission / reception between the terminal 100 and the base station 200. As shown in Fig.

In steps S1001 and S1002, a synchronization signal is transmitted, and a cell search process using the synchronization signal is performed. That is, in step S1001, the reception band of the reception RF unit 105 is sequentially moved under the control of the control unit 140, and the frame synchronization unit 115 searches for the P-SCH. This establishes initial synchronization. In step S1002, the frame synchronization unit 115 makes a blind decision on the S-SCH arranged in the resource having a predetermined relationship with the placement resource of the P-SCH. As a result, precise synchronization is obtained, and a cell ID corresponding to the S-SCH sequence is obtained.

In steps S1003 to S1005, the notification signal and the control channel are transmitted, and the RACH preamble is ready to be transmitted using the notification signal and the control channel.

That is, in step S1003, the information included in the received D-BCH signal (e.g., the frequency and frequency band of the upstream pair band or the PRACH (Physical Random Access Channel)) acquired by the notification information receiving unit 125 Information), the control unit 140 specifies the placement information of the PDCCH. Then, the controller 140 outputs the PDCCH allocation information to the PDCCH receiver 130, and instructs the PDCCH receiver 130 to decode the signal located at the frequency position according to the information.

In step S1004, the frequency position information of the D-BCH is extracted from the PDCCH receiver 130 according to a decoding instruction from the controller 140. [

In step S1005, based on the frequency position information of the D-BCH, information included in the received D-BCH signal (e.g., frequency and frequency band of the upstream pair band or information such as PRACH (Physical Random Access Channel) Is extracted from the notification information receiving unit 125. [

In step S1006, under the control of the control unit 140, the RACH preamble unit 145 transmits the RACH preamble according to the frequency band of the uplink frequency band and the PRACH obtained in step S1003.

In step S1007, the controller 265 of the base station 200 that has received the RACH preamble assigns the uplink frequency to the terminal 100 that has transmitted the RACH preamble and transmits the uplink frequency allocation information to the terminal 100 .

In step S1008, the control unit 140 of the terminal 100 receiving the uplink frequency allocation information transmits the terminal capability information of its own using the uplink frequency.

In step S1009, when the received terminal capability information indicates that the terminal is an LTE + terminal, the control unit 265 transmits a band movement instruction.

Upon receiving the band movement instruction, the terminal 100 moves the reception band to the unit band indicated by the band movement instruction and starts data communication.

In step S1010, the control unit 140 gives a decoding instruction to the PDCCH receiving unit 130 based on the PDCCH position information of the movement destination unit band included in the band movement instruction, and the PDCCH receiving unit 130 transmits D And obtains the frequency position information of -BCH +.

In step S1011, the notification information receiving unit 125 extracts information included in the reception D-BCH + based on the frequency position information of D-BCH +.

Here, the band movement instruction includes all information necessary for reading the PDCCH of the movement destination unit band and the like. Therefore, the terminal 100, which is an LTE + terminal, does not need to read the contents of the D-BCH + in order to start data communication in the movement destination unit band.

However, in the D-BCH, in addition to the information necessary for starting communication, information on a slot capable of transmitting a sounding reference used for acquiring uplink channel information and information on power control, Information in which the content of the parameter changes in accordance with the number of terminals is included.

This information needs to be read during communication (i.e., in an active state (state in which the terminal 100 continuously receives the PDCCH from the base station 200 for each subframe) by the terminal 100). Therefore, the base station 200 transmits D-BCH + including only necessary information during communication. That is, since the information that does not need to be read when the terminal 100 is in the active state is deleted, the size of D-BCH + can be reduced. That is, resource overhead is reduced.

As described above, according to the present embodiment, the OFDM signal forming unit 225 of the base station 200, which is an LTE + base station, transmits the P-SCH, the S-SCH, and the P -BCH, and D-BCH to a unit band of a plurality of unit bands usable in the own station, and maps D-BCH + that can be decoded only by the LTE + terminal to all of a plurality of unit bands To form a transmitted multiplexed signal.

By doing this, the synchronization signal and the notification signal necessary for the LTE terminal and the LTE + terminal can be transmitted by the mapping method with high resource utilization efficiency.

When the terminal that has transmitted the terminal capability information is the LTE + terminal in the base station 200, the control unit 265 transmits a band movement instruction for instructing the change of the reception band to the terminal. In contrast, in the terminal 100, the control unit 265 changes the reception band from the initial access unit band to the unit band corresponding to the band movement instruction.

By doing so, the number of terminals performing communication in each unit band can be leveled between unit bands. That is, according to the mapping method, since the LTE terminal can access only a part of the unit bands (i.e., a unit band to which the P-SCH, the P-BCH, and the D-BCH are mapped) The LTE terminal tends to be fixed in the unit band of " Thus, by moving the reception band of the LTE + terminal to a unit band other than the unit band to which the P-SCH, the S-SCH, the P-BCH, and the D-BCH are mapped, it is possible to distribute the terminals in a balanced manner to each unit band. That is, it is possible to prevent waste of resources that may occur in the mapping method of FIG.

More specifically, the terminal 100 is configured such that the reception RF section 105 can change the reception band, and the frame synchronization section 115 receives, from the reception signal received by the reception RF section 105, Acquires an SCH that can be decoded by both the LTE terminal and the LTE + terminal, synchronizes with the base station 200, and transmits the RACH preamble signal to the RACH preamble section 145 And transmits the RACH preamble to the base station 200 at the stage where the preparation of the RACH preamble is completed. The control unit 140 sequentially changes the reception band of the reception RF unit 105 before establishing the synchronization and sets the frequency position of the synchronization channel from the base station 200 before the transmission of the RACH preamble And prepares to transmit the RACH preamble on the basis of the P-BCH, the PDCCH and the D-BCH, which are transmitted in the initial access unit band including the LTE terminal and the LTE + UE and can be decoded by both the LTE terminal and the LTE + terminal. After transmitting the RACH preamble, the control unit 140 acquires the report resource allocation information notified by the PDCCH from the base station 200 and transmits the report resource allocation information to the self terminal Capacity information to the base station 200 and changes the reception band from the initial access unit band based on the band movement instruction transmitted by the base station 200 according to the terminal capability information.

The band movement instruction transmitted from the base station 200 includes information necessary for starting data communication in the movement destination unit band. Specifically, the band movement instruction includes the position of the center frequency, the width of the PDCCH in the frequency axis direction, the number of antennas of the base station in the band to which the mobile station is transmitted, that is, the number of antennas transmitting the reference signal, The number of OFDM resources used for the response signal to the data signal).

Thus, even if the terminal 100 is moved in a unit band in which the P-SCH, the S-SCH, the P-BCH, and the D-BCH are not mapped, the terminal 100 can start data communication without any problem.

According to the mapping method, D-BCH + is always mapped to the movement destination unit band of the terminal 100. [ This D-BCH + contains information necessary for the LTE + terminal to continue communication. Therefore, the terminal 100 can continue the stable communication in the destination band.

Further, in the above description, when a series of data communication with the base station 200 is terminated, the terminal 100 switches to the idle mode by independently switching the RF center frequency. However, the present invention is not limited to this. When a series of data communication between the terminal 100 and the base station 200 is terminated, the base station 200 transmits a band movement instruction to the terminal 100 again, The terminal 100 may be moved to a band.

(Embodiment 2)

In Embodiment 2, the LTE + base station maps a reference signal, which can be decoded only in the LTE + terminal, to a unit band other than the unit band to which the LTE synchronization channel, the LTE notification signal and the LTE dynamic notification signal are mapped. Then, the LTE + UE measures the reception strength of the reference signal in the movement destination unit band, and prepares for handover. The basic configuration of the terminal and the base station according to the present embodiment is the same as that of the terminal and the base station described in the first embodiment. Therefore, the terminal according to the present embodiment will be described with reference to Figs. 4 and 5. Fig.

In the base station 200 according to the second embodiment, the OFDM signal forming unit 225 is a P-SCH, an S-SCH, and a P-SCH that can be decoded by both the LTE terminal and the LTE + BCH, and D-BCH to a unit band of a plurality of unit bands usable in the own station (own station), and to simultaneously transmit D-BCH + that can be decoded only by the LTE + terminal to all of a plurality of unit bands Mapping. The OFDM signal forming unit 225 further generates a reference signal that can be decoded only by the LTE + terminal in a unit band other than the unit band to which the P-SCH, the S-SCH, the P-BCH, and the D- Mapping. Concretely, the synchronization signal (P-SCH +, S-SCH +) which can be decoded only in the LTE + terminal is used as the reference signal. That is, the base station 200 according to the second embodiment transmits a synchronization signal, a notification signal, and a control channel using the mapping method shown in FIG. 8 or the like.

In the terminal 100 according to the second embodiment, the notification information receiving unit 125 receives a reference signal transmitted from an LTE + base station other than the base station 200, which is a transfer destination unit band and is a partner of data communication.

A measurement unit (not shown) provided in the control unit 140 measures the reception strength of the reference signal received by the notification information receiving unit 125. [

The operation of the terminal 100 having the above configuration will be described. Fig. 9 is a diagram for explaining the operation of the terminal 100 according to the second embodiment. In Fig. 9, adjacent cells A and B have the same communication band.

Now, the terminal 100 is moved to the unit band 3 of the cell B (the cell of the base station 200) and then performs data communication. At this time, the LTE + base station of cell A transmits reference signals (P-SCH +, S-SCH +) in unit band 3. Therefore, the terminal 100 can receive the reference signals (P-SCH +, S-SCH +) transmitted from the adjacent cell A without moving the unit band. Therefore, the terminal 100 can measure the reception strength of the reference signal transmitted from the adjacent cell A while performing data communication with the base station 200. [ That is, the measurement processing for the adjacent cell A performed for handover preparation and the reception of the downlink data from the cell B can be performed simultaneously. Thus, the power consumption of the terminal 100 is reduced.

The number of symbols to which the reference signals P-SCH + and S-SCH + are mapped in a subframe (i.e., a region defined by a predetermined frequency bandwidth and a predetermined time length) Is at least better than the number of symbols mapped. In this case, information such as the number of symbols to which the reference signals (P-SCH +, S-SCH +) are mapped in the subframe between the adjacent LTE + base stations is shared. The base station 200 transmits transmission position information of the reference signals (P-SCH +, S-SCH +) of the adjacent cell to the terminal 100 in order to facilitate the measurement processing of the reference signal transmitted from the adjacent cell Frequency, or time) of the neighboring cell may be explicitly notified, or may be implicitly notified by giving a measurement execution instruction to the frequency corresponding to the terminal in accordance with the timing of transmitting the reference signal.

In the above-described embodiment, the present invention is described by taking the case of hardware as an example, but the present invention can also be implemented by software.

Each of the functional blocks used in the description of the embodiment is realized as an LSI which is typically an integrated circuit. These may be individually monolithic, or may be monolithic including some or all of them. Here, the LSI is referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.

Note that the method of making the integrated circuit is not limited to the LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after the LSI fabrication, or a reconfigurable processor capable of reconfiguring the connection and setting of the circuit cells in the LSI may be used.

Also, if the technique of integrated circuit replacement to replace the LSI by the progress of the semiconductor technology or a separate technology derived therefrom comes out, the integration of the functional blocks may naturally be performed using the technology. Application of biotechnology, etc. may be possible.

The disclosures of the specification, drawings and abstract included in the Japanese application of the patent application 2008-201005 filed on August 4, 2008 are all incorporated herein by reference.

Industrial availability

A base station, a terminal, a band allocation method, and a downlink data communication method according to the present invention are characterized by comprising: a first system for allocating independent single communication for each unit band having a predetermined bandwidth; This is useful for realizing a method of mapping a synchronization signal and a notification signal with high resource use efficiency when a second system capable of allocating a plurality of unit bands coexists.

Claims (13)

A terminal apparatus for simultaneously communicating with a plurality of component carriers in a second system different from a first system for performing communication with a single component carrier,
A synchronizing unit for synchronizing the first component carrier among the plurality of component carriers;
(PDCCH) to a second component carrier added to the first component carrier among the plurality of component carriers after the synchronization processing is performed, ) ≪ / RTI >
Respectively,
Wherein the indication information includes information on an uplink and a frequency in the second component carrier
Terminal device.
The method according to claim 1,
Wherein the indication information further includes information on a bandwidth, a number of antennas of a base station, and resources used for transmitting a response signal to an uplink data signal.
3. The method according to claim 1 or 2,
And a synchronization signal is not arranged in the second component carrier.
A receiving method in a terminal apparatus that simultaneously communicates with a plurality of component carriers in a second system different from a first system that communicates with a single component carrier,
A synchronization step of performing synchronization processing in a first component carrier among the plurality of component carriers;
(PDCCH) to a second component carrier added to the first component carrier among the plurality of component carriers after the synchronization processing is performed, ) ≪ / RTI >
, ≪ / RTI &
Wherein the indication information includes information on an uplink and a frequency in the second component carrier
Receiving method.
delete delete delete delete 5. The method of claim 4,
Wherein the indication information further comprises information regarding a bandwidth, a number of antennas of a base station, and resources used for transmitting a response signal to an uplink data signal.
10. The method according to claim 4 or 9,
And a synchronization signal is not arranged in the second component carrier.
3. The method according to claim 1 or 2,
Wherein the first system is an LTE system and the second system is an LTE-Advanced system.
10. The method according to claim 4 or 9,
Wherein the first system is an LTE system and the second system is an LTE-Advanced system.
An integrated circuit for controlling a process of simultaneously communicating with a plurality of component carriers in a second system different from a first system that communicates with a single component carrier,
A synchronization processing for performing synchronization processing in a first component carrier among the plurality of component carriers;
(PDCCH) to a second component carrier added to the first component carrier among the plurality of component carriers after the synchronization processing is performed, ) ≪ / RTI >
Lt; / RTI >
Wherein the indication information includes information on an uplink and a frequency in the second component carrier
integrated circuit.

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